Polishing-wheel.



S. H. MILLS.

POLISHING WHEEL.

APPLICATION FILED FEB. I2. 1917.

Patented Apr. 29,1919.

SAMUEL HOBERT MILLS, OF MONTPELIER, VERMONT.

POLISHING-WHEEL.

1,302,4ttl4l.

Specification of Letters Patent.

Patented Apr. 29, 1919.

Application filed February 12, 1917. Serial No. 148,200.

To all whom it may concern:

Be it known that I, SAMUEL HOBERT MILLS, a citizen of the United States,residing at Montpelier, in the county of Washington and State ofVermont, have invented a new and useful Polishing-WheeL of which thefollowing is a specification.

The present invention appertains to polishing and grinding devices, andaims to provide a novel and improved appliance of that character forpolishing and dressing stone, granite, and similar material to carry outthe first process of leveling the material preparatory to the second orfinishing process, known as emerying.

It is the object of the invention to provide a device of the natureindicated which will provide a hard, smooth, uniform surface, thegrinding or cutting abrasive being distributed to all parts of thewheel, and the finer and harder the surface, the quicker and better isthe desired result accomplished.

It is also within the scope of the invention to provide a polishingwheel which is improved generally in construction and details, toenhance the utility, efiiciency and durability of the device.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, can be made within thescope of what is claimed, without departing from the spirit of theinvention.

The invention is illustrated in the accompanying drawings, whereinFigure 1 is a face view of the improved polisher.

Fig. 2 is an edge elevation thereof, portions being broken away andshown in section.

Fig. 3 is a reverse or back view of the wheel.

The polishing wheel embodies a disk or plate 1 of any suitable material,and provided with a central opening 2, which is bridged by an attachingmember 3 bolted or otherwise fastened at its ends to the rear surface ofthe disk. The member 3 has a pair of outstanding lugs 4 to receive theend of a rotary shaft therebetween, to which he the disk is fastened bymeans of a securing element 5 engageable through the lugs and shaft (notshown).

Disposed upon the face of the disk 1 is an annular series of spirallyarranged grinding or cutting blades, of which there are two arcuatesets, each including the blades 6, 7, 8, 9, 10 and 11. As illustrated.most of the blades are curved spirally, although the blades 8 arestraight, and the blades are dis posed obliquely in the same directionrelative to the circumference of the disk. The blades are arranged atsubstantially angles of 135 degrees to the radii intersecting theblades. Also carried by the face of the disk are two diametricallyopposite feeding blades or flanges 12, each extending through an arc ofabout 180 degrees, said flanges being disposed next outside therespective sets of grinding blades, and also being disposed spirally.The outer ends of the flanges 12, which are nearest the edge of the diskare preferably curved, as at 13, these being the forward ends of theflanges, and said flanges extend gradually away from the edge of thedisk from their forward to their rear ends. The ends of the two flangesare located nor. 1.- one another and are spaced apart, the rear ends ofthe flanges being spaced inwardly from the forward ends of the otherflanges. The grinding blades and flanges are secured detachably to theface of the disk by means of bolts 14 or other securing elements engagedthrough the disk and taking into the blades and flanges. Thus, theblades and flanges can be readily removed individually, and replacedwhen worn out or broken. It is to be noted that the first blade 6 ofeach set extends inwardly from a point near the forward end of theflange 12, while the last blade 11 of each set extends inwardly from apoint near the rear end of the respective flange. The outer ends of theblades 6, 7, 8, 9, 10 and 11 of each set terminate at the margin of animaginary ellipse indicated by dotted lines at E and are located closerto the respective flange 12 in succession, that is, the space betweenthe outer end of the blade 6 and respective flange 12 is slightly widerthan the space between the outer end of the blade 7 and flange 12, andthe space between the outer end of the blade 8 and flange 12 is narrowerthan that between the outer end of the blade 7 and flange 12, and so on.Thus, the outer ends of the annular series of flanges are disposedsubstantially in an elliptical line 15 whose minor axis is near the endsof the flanges 12.

In using the wheel, it is rotated in the direction of the arrow in Fig.1, the outer ends of the flanges and blades being foremost, and theedges of said blades and flanges being in a plane parallel with theplane of the disks. When the grinding blades are brought against thesurface of the material, they will grind or cut it away, and as the diskis moved about the surface, the forward ends of the feeding flanges 12catch the loosened abrasive material, which will be directed inwardlyalong the inner surfaces of said flanges. The first blades 6 of the twosets will catch a portion-o1": the abrasive material directed inwardlyby the flanges, the second blades 7 will catch a portion of thematerial, and so on, whereby the material directed inwardly by feedingflanges will be distributed to the various blades, and the material willbe directed in Wa-rdly by said blades throughout the surface of thewheel; The abrasive material is thus distributed along the edges of thegrindingblades, and the grinding action is thereby rendered moreeffective, to produce a polished surface free from scratches, and hard,smooth and uniform in character. The wheel will not become clogged inuse, and the blades can either be curved or straight, whichever is bestunder the circumstances.

Having thus described the invention, what is claimed as new is Apolishing wheel embodying a disk, opposed eccentrically arranged flangesupon one face of the disk with their advancing ends pointed and nearerthe periphery of the disk than their other ends, said flanges being freeof angles and being curved gradually from end to end, a series ofgrinding blades extending toward the center of the disk from pointsadjacent each of the flanges, each blade of each series being arrangedwith its inner ends along lines tangent to the middle portion of thedisk, certain of the blades of each series being curved frolnend to endand one of the blades of eaclrseries being straight, all of the bladesconverging toward their inner ends, and the curved blades of each seriesbeing diilcrently curved, the outer ends terminating at the margin of animaginary ellipse between the flanges.

In testimony that I claim the foregoing as my own, I have heretoafiix'ed my signature in the prcsenceof two witnesses;

SAMUEL HOBERT MILLS.

Witnesses Bnuon MCDONALD, FRANK J. MARSHAL Copies otthispetent may beobtained for five cents each, by addressing the "Commissioner ofPatents. Washington, D, O.

